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  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C237/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups
  • C07C237/24—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atom of at least one of the carboxamide groups bound to a carbon atom of a ring other than a six-membered aromatic ring of the carbon skeleton
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  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D215/00—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
  • C07D215/02—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
  • C07D215/16—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D215/38—Nitrogen atoms
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P9/00—Drugs for disorders of the cardiovascular system
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  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C235/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms
  • C07C235/02—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton
  • C07C235/32—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton the carbon skeleton containing six-membered aromatic rings
  • C07C235/34—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton the carbon skeleton containing six-membered aromatic rings having the nitrogen atoms of the carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C235/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms
  • C07C235/02—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton
  • C07C235/32—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton the carbon skeleton containing six-membered aromatic rings
  • C07C235/36—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton the carbon skeleton containing six-membered aromatic rings having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a ring other than a six-membered aromatic ring
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C237/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups
  • C07C237/02—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of the carbon skeleton
  • C07C237/20—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of the carbon skeleton the carbon skeleton containing six-membered aromatic rings
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  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C237/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups
  • C07C237/02—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of the carbon skeleton
  • C07C237/22—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of the carbon skeleton having nitrogen atoms of amino groups bound to the carbon skeleton of the acid part, further acylated
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  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D295/00—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms
  • C07D295/16—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms acylated on ring nitrogen atoms
  • C07D295/18—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms acylated on ring nitrogen atoms by radicals derived from carboxylic acids, or sulfur or nitrogen analogues thereof
  • C07D295/182—Radicals derived from carboxylic acids
  • C07D295/185—Radicals derived from carboxylic acids from aliphatic carboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
  • C07D333/50—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
  • C07D333/52—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes
  • C07D333/62—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the hetero ring
  • C07D333/68—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
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  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2602/00—Systems containing two condensed rings
  • C07C2602/02—Systems containing two condensed rings the rings having only two atoms in common
  • C07C2602/04—One of the condensed rings being a six-membered aromatic ring
  • C07C2602/08—One of the condensed rings being a six-membered aromatic ring the other ring being five-membered, e.g. indane
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2603/00—Systems containing at least three condensed rings
  • C07C2603/56—Ring systems containing bridged rings
  • C07C2603/58—Ring systems containing bridged rings containing three rings
  • C07C2603/70—Ring systems containing bridged rings containing three rings containing only six-membered rings
  • C07C2603/74—Adamantanes

Definitions

• the present invention relates to novel benzene derivatives which promote production or secretion of nerve growth factor (abbreviated to "NGF”), while exhibiting weak side effects.
• NGF nerve growth factor
• NGF neurotrophic factor
• NGF is a high molecular weight protein (having a molecular weight of 13000 for the monomeric form, and 26000 for the dimeric form), and so there are problem associated with its administration as a drug and general concerns for safety.
• catechol neurotransmitters such as adrenaline and noradrenaline, and catechol analogs, can promote NGF formation. These compounds have side effects, particularly in nerve excitation.
• European Patent Specification 399,814 published on 28 November 1990 discloses phenol derivatives which promote the production and secretion of human nerve growth factor. Related compounds of similar utility are disclosed in Japanese Patent Application 1-217211 which was filed on 25 August 1989 and published as Japanese Patent Kokai 3-83921 on 09 April 1991.
• An object of the present invention is the development of benzene derivatives effective as drugs which promote nerve growth factor or effective as intermediates for the preparation of such drugs.
• a particular object is the provision of such drugs with reduced side effects, in particular with low nerve excitation activity.
• Further objects of this invention include the provision of pharmaceutical compositions for use in treatment of peripheral nerve damage and treatment of damage to the functioning of the central nervous system, especially in Alzheimer's disease and brain ischemia.
• Alkyl groups in the definition of the compounds of the present invention typically comprise straight or branched chain alkyl groups having from 1 to 6 carbon atoms, for example a methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec -butyl, tert -butyl, pentyl, isopentyl, 2-methylbutyl, neopentyl, 1-ethylpropyl, n-hexyl, 4-methylpentyl, 3-methylpentyl, 2-methylpentyl, 1-methylpentyl, 3,3-dimethylbutyl, 2,2-dimethylbutyl, 1,1-dimethylbutyl, 1,2-dimethylbutyl, 1,3-dimethylbutyl, 2,3-dimethylbutyl or 2-ethylbutyl group.
• Preferred alkyl groups are straight or branched chain alkyl groups having from 1 to 4 carbon atoms.
• Cycloalkyl groups in the definition of the compounds of the present invention typically comprise 3-to 10-membered saturated cyclic hydrocarbon groups which may optionally be bridged, for example a cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, norbornyl or adamantyl group.
• Preferred cycloalkyl groups are 5- to 10-membered opitionally bridged saturated cyclic hydrocarbon groups.
• a particularly preferred cycloalkyl group is an adamantyl group.
• Aryl groups in the definition of the compounds of the present invention typically comprise 6- to 14-membered aromatic cyclic hydrocarbon groups, for example a phenyl, naphthyl, phenanthrenyl or anthracenyl group; preferably a phenyl group.
• the aryl group may be fused with a 3- to 10-membered cycloalkyl group, giving for example a 2-indanyl group.
• Aralkyl groups in the definition of the compounds of the present invention typically comprise 1 alkyl group substituted by 1 to 3 aryl groups.
• aralkyl groups include a benzyl, naphthylmethyl, indenylmethyl, phenanthrenylmethyl, anthracenylmethyl, diphenylmethyl, triphenylmethyl, 1-phenethyl, 2-phenethyl, 1-naphthylethyl, 2-naphthylethyl, 1-phenylpropyl, 2-phenylpropyl, 3-phenylpropyl, 1-naphthylpropyl, 2-naphthylpropyl, 3-naphthylpropyl, 1-phenylbutyl, 2-phenylbutyl, 3-phenylbutyl, 4-phenylbutyl, 1-naphthyl-butyl, 2-naphthylbutyl, 3-naphthylbut
• Heterocyclyl groups in the definition of the compounds of the present invention generally comprise an optionally fused 5- to 7-membered heterocyclyl group containing from 1 to 4 heteroatoms selected from nitrogen atoms, oxygen atoms and sulphur atoms.
• This generality is subject where indicated to the requirement specified that certain heterocyclyl groups have a ring nitrogen atom as their point of binding: such heterocyclyl groups may have more than one nitrogen heteroatom.
• the heterocyclyl group can be aromatic or partly or fully saturated, and can be fused with 1 or 2 aryl rings, usually with 1 or 2 benzene rings.
• Typical heterocyclyl groups embracing heterocyclyl groups in general and also embracing heterocyclyl groups having a ring nitrogen atom as their binding point comprise: aromatic heterocyclyl groups, for example a furyl, thienyl, pyrrolyl, azepinyl, pyrazolyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, 1,2,3-oxadiazolyl, triazolyl, tetrazolyl, thiadiazolyl, pyranyl, pyridyl, pyridazinyl, pyrimidinyl or pirazinyl group; partially or completely reduced heterocyclyl groups, for example a morpholinyl, thiomorpholinyl, pyrrolidinyl, pyrrolinyl, imidazolidinyl, imidazolinyl, pyrazolidinyl, pyrazolinyl, pipe
• Preferred heterocyclyl groups are 5- to 7-membered heterocyclic groups containing at least one nitrogen atom and further optionally containing 1 sulphur or oxygen atom, which may optionally be partially or completely saturated and may optionally be fused to an aryl ring.
• Such preferred heterocycle groups include: aromatic heterocyclic groups, for example a pyrrolyl, azepinyl, pyrazolyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, 1,2,3-oxadiazolyl, triazolyl, tetrazolyl, thiadiazolyl, pyridyl, pyridazinyl, pyrimidinyl or pirazinyl group; partially or completely saturated heterocyclyl group, for example a morpholinyl, thiomorpholinyl, pyrrolidinyl, pyrrolinyl, imidazolidinyl, imidazolinyl, pyrazolidinyl, pyrazolinyl, piperidyl or piperazinyl group; or fused heterocyclyl groups, for example a quinolyl or benzothienyl group.
• aromatic heterocyclic groups for example
• heterocycle groups comprise an imidazolyl, oxazolyl, isoxazolyl, thiazolyl, piperidyl or piperazyl group.
• Halogen atom in the definition of the compounds of the present invention can suitably be a fluorine, chlorine, bromine or iodine atom.
• Alkoxy groups in the definition of the compounds of the present invention typically comprise a said alkyl group and an oxygen atom, giving straight or branched chain alkoxy groups having from 1 to 6 carbon atoms, for example a methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec -butoxy, tert -butoxy, pentoxy, isopentoxy, 2-methylbutoxy, neopentoxy, hexyloxy, 4-methylpentoxy, 3-methylpentoxy, 2-methylpentoxy, 3,3-dimethylbutoxy, 2,2-dimethylbutoxy, 1,1-dimethylbutoxy, 1,2-dimethylbutoxy, 1,3-dimethylbutoxy or 2,3-dimethylbutoxy group
• Preferred alkoxy groups are straight or branched chain alkoxy groups having from 1 to 4 carbon atoms.
• Haloalkyl groups in the definition of the compounds of the present invention typically comprise a said alkyl group and 1 to 3 halogen atoms, for example a trifluoromethyl, trichloromethyl, difluoromethyl, dichloromethyl, dibromomethyl, fluoromethyl, 2,2,2-trichloroethyl, 2,2,2-trifluoroethyl, 2-bromoethyl, 2-chloroethyl, 2-fluoroethyl or 2,2-dibromoethyl group.
• a preferred haloalkyl group is a halogenomethyl group.
• a particularly preferred haloalkyl group is a trifluoromethyl group.
• the protected amino groups which may be adopted for the group R1 and/or for the group R2 comprise an amino group protected by 1 or 2 amino protecting groups.
• the identity of the protecting group is not particularly critical, and typically it is one conventionally used for protection of an amino group, preferably for instance: aliphatic acyl groups such as an alkanoyl group having from 1 to 20 carbon atoms, for example a formyl, acetyl, propionyl, butyryl, isobutyryl, pentanoyl, pivaloyl, valeryl, isovaleryl, octanoyl, lauroyl, myristoyl, tridecanoyl, palmitoyl or stearoyl group, such as a halogenated aliphatic acyl group, more especially a haloalkanoyl group having from 1 to 6 carbon atoms and having from 1 to 3 halogen atoms, for example a chloroacetyl, dichloroacetyl
• the more preferred protecting groups comprise an aliphatic acyl or aromatic acyl group or an amino acid residue.
• the protected hydroxy group which may be adopted for the group R2 may be a hydroxy protecting group effective as a protecting group in a chemical reaction, or by a hydroxy protecting group hydrolyzable in vivo upon administration.
• the compounds of formula (I) are synthetic intermediates.
• the compounds of formula (I) are pro-drugs.
• the identity of the protecting group is not particularly critical, and typically it is one conventionally used for protection of a hydroxy group, preferably for instance: for a synthetic intermediate: a said aliphatic acyl group; a said aromatic acyl group; a tetrahydropyranyl or tetrahydrothiopyranyl group optionally substituted by 1 or 2 alkoxy groups having 1 to 6 carbon atoms or by 1 or 2 halogen atoms, for example a tetrahydropyran-2-yl, 3-bromotetrahydropyran-2-yl, 4-methoxytetrahydropyran-4-yl, tetrahydrothiopyran-2-yl or 4-methoxytetrahydrothiopyran-4-yl group; a tetrahydrofuranyl or tetrahydrothiofuranyl group, for example a tetrahydrofuran-2-yl or tetrahydrothiofuran-2-yl group
• the more preferred protecting groups comprise an aliphatic acyl group, an aromatic acyl group, an aralkyl group, or a protecting group which is easily hydrolyzed in vivo and employed for preparing a pro-drug for administration.
• the heterocyclyl group binding at the nitrogen atom on its ring which can be a substituted heterocyclyl group substituted as defined, is suitably an optionally fused 5- to 7-membered heterocyclyl group containing the binding nitrogen atom and optionally further containing from 1 or 2 further heteroatoms selected from nitrogen atoms, oxygen atoms and sulphur atoms.
• This heterocyclyl group can be aromatic or partly or fully saturated, and can be fused with 1 or 2 aryl rings, usually with 1 or 2 benzene rings.
• Preferred heterocyclyl groups include an aromatic heterocyclyl group, for example a pyrrolyl, azepinyl, pyrazolyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, 1,2,3-oxadiazolyl, triazolyl, tetrazolyl, thiadiazolyl, pyridyl, pyridazinyl, pyrimidinyl or pyrazinyl group; a partially or completely saturated heterocyclyl group, for example a morpholinyl, thiomorpholinyl, pyrrolidinyl, pyrrolinyl, imidazolidinyl, imidazolinyl, pyrazolidinyl, pyrazolinyl, piperidyl or piperazinyl; more preferably a morpholinyl, thiomorpholinyl, piperidyl or piperazyl group; or
• Preferred examples of a substituted amino group substituted by 1 to 2 groups selected from the members of Substituent Group A comprise an amino group substituted by 1 or 2 straight or branched chain alkyl groups having from 1 to 4 carbon atoms, such as a methylamino, ethylamino, propylamino, isopropylamino, butylamino, isobutylamino, dimethylamino, diethylamino or methylethylamino group; an amino group substituted by one straight or branched chain alkyl group having from 1 to 4 carbon atoms and one 6- to 10-membered aromatic cyclic hydrocarbon group such as methylphenylamino, ethylphenylamino, propylphenylamino, isopropylphenylamino, butylphenylamino, isobutylphenylamino; an amino group substituted by one or two 5- to 10-membered optionally bridged saturated cyclic hydro
• Preferred examples of a substituted hydroxy group substituted by a group selected from the members of Substituent Group A comprise a hydroxy group substituted by a straight or branched chain alkyl group having from 1 to 4 carbon atoms, giving a straight or branched chain alkoxy group having from 1 to 4 carbon atoms, such as a methoxy, ethoxy, propoxy, isopropoxy, butoxy or isobutoxy group; a hydroxy group substituted by an aralkyl group, giving an aralkoxy group, such as a benzyloxy, phenethyloxy or diphenylmethyloxy group.
• Preferred examples of a substituted heterocyclyl group having a ring nitrogen atom as the point of binding and substituted by 1 to 2 groups selected from the members of Substituent Group A and Substituent Group B comprise a halo 5- or 6-membered heterocyclyl group such as a 3-bromopiperidino, 3-fluoromorpholinyo, 2-fluoropiperazino, 2-chloropiperidino, 4-chloropiperidino or 2,4-dichloropiperidino group; a C1 ⁇ 4-alkoxy 5-or 6-membered heterocyclyl group such as a 2-ethoxymorpholino or 3,4-dimethoxypiperidino group; a C2 ⁇ 5-alkoxycarbonyl 5- or 6-membered heterocyclyl group such as a 2-methoxycarbonylmorpholino or 2-methoxycarbonylpiperazino group; a nitro 5- or 6-membered heterocyclyl group such as a 3-nitropiperidino group;
• Preferred examples of a substituted C5 ⁇ 10-cycloalkyl group substituted by 1 to 3 groups selected from the members of Substituent Group B and Substituent Group C comprise: a halo- C5 ⁇ 10-cycloalkyl group such as a 2-chlorocyclopentyl, 3-chlorocyclopent-yl, 2-fluorocyclopentyl, 3-fluorocyclopentyl, 2-chlorocyclohexyl, 3-fluorocyclohexyl, 4-bromocyclohexyl, 3,4-difluorocyclohexyl, 2-fluoroadamantyl or 3-fluoroadamantyl group; a C1 ⁇ 4-alkoxy- C5 ⁇ 10-cycloalkyl group such as a 2-methoxycyclopentyl, 3-ethoxycyclopentyl, 2-propoxycyclohexyl, 3-methoxycyclohexyl, 4-methoxycyclohexyl
• Preferred examples of a substituted aryl group substituted by 1 to 3 groups selected from the members of Substituent Group B and Substituent Group C comprise a halo- C6 ⁇ 10-aryl group such as a 2-fluorophenyl, 3-bromophenyl, 4-fluorophenyl, 3,4-difluorophenyl, 2,4-difluorophenyl, 2,5-difluorophenyl, 2-chlorophenyl, 3-chlorophenyl, 4-chlorophenyl, 3,4-dichlorophenyl, 2,4-dichlorophenyl, 2,5-dichlorophenyl, 3,4,5-tribromophenyl or 2-fluoronaphthyl group; a C1 ⁇ 4-alkoxyl-C6 ⁇ 10-aryl group such as a 2-ethoxyphenyl, 3-propoxyphenyl, 4-methoxyphenyl, 3,4-dimethoxypheny
• Preferred examples of a substituted aralkyl group substituted by 1 to 3 groups selected from the members of Substituent Group B and Substituent Group C comprise a halo- C7 ⁇ 12-aralkyl group such as a 2-fluorobenzyl, 3-bromophenethyl, 4-fluorobenzyl, 3,4-difluorobenzyl, 2,4-difluorobenzyl, 2,5-difluorobenzyl, 2-chlorophenethyl, 3-chlorobenzyl, 4-chlorobenzyl, 4-bromobenzyl, 4-chlorophenethyl, 3,4-dichlorobenzyl, 2,4-dichlorobenzyl, bis(2,4-dichlorophenyl)methyl, 2,5-dichlorobenzyl, 3,4,5-tribromobenzyl or 2-fluoronaphthylmethyl group; a C1 ⁇ 4-alkoxyl- C7
• Preferred examples of a substituted heterocyclyl group substituted by 1 to 3 groups selected from the members of Substituent Group B and Substituent Group C comprise a haloheterocyclyl group such as a 3-fluorotetrahydrobenzothiophen-2-yl, 3-bromopiperidin-4-yl, 2-fluoroquinolin-3-yl, 3-fluoromorpholin-2-yl, 3-fluoropiperazin-2-yl, 2-chloropiperidin-4-yl, 3-chlorotetrahydrobenzothiophen-2-yl, 4-chloropiperidin-2-yl or 2,6-dichloropiperidin-4-yl group; a C1 ⁇ 4 alkoxy-heterocyclyl group such as a 3-ethoxymorpholin-2-yl, 4-methoxyquinolin-8-yl, 2,6-dimethoxypiperidin-4-yl group; a C2 ⁇ 5 alkoxycarbonyl-heterocycly
• the compounds (I) of the present invention may exist in the form of salts.
• Preferred salts include a salt with an inorganic acid such as a hydrohalide salt, for example a hydrofluoride, hydrochloride, hydrobromide or hydroiodide salt, or a salt with another inorganic acid, for example a nitrate, perchlorate, sulphate or phosphate salt; a salt with an organic acid such as an alkanesulphonate salt, more especially an optionally halo substituted alkanesulphonate have having 1 to 3 carbon atoms in the alkane group and 0 to 5 halogen atom substituents, for example a methanesulphonate, trifluoromethanesulphonate, ethanesulphonate, trifluoromethanesulphonate or pentafluoroethanesulphonate salt, such as an arylsulphonate salt, more especially an optionally alkyl-substituted
• Preferred salts also include onium salts, such as those formed when a member of Substituent Group A is present as a substituent at a tertiary nitrogen, for example when a member of Subsituent Group A is a fourth group on a nitrogen atom itself being saturated and being the point of binding of a heterocyclic group R3. Salts which are pharmaceutically acceptable salts form an aspect of the present invention.
• the compounds of the present invention may exist in an optically active form.
• stereoisomers with R configuration or S configuration are possible. If m is 1 or 2, geometric isomers are possible.
• the present invention embraces all of these individual isomers and any mixture thereof.
• Preferred compounds of formula (I) of the present invention include:
• Preferred compounds among those mentioned above are those numbered: 1, 2, 4, 5, 6, 7, 8, 9, 15, 24, 25, 26, 29, 47, 48, 49, 64, 66, 78, 79, 80, 82, 87, 88, 89, 90, 91, 105, 106, 107, 126, 127, 128, 129, 144, 145, 146, 147, 161, 162, 163, 167, 169, 170, 172, 174, 175, 184, 185, 189, 190, 192, 194, 199, 204, 209, 210, 212, 217, 222, 227, 228, 230, 236, 239, 247, 250, 256 and 260, and salts thereof.
• the more preferred compounds are those numbered: 4, 5, 25, 29, 64, 79, 91, 145, 146, 184, 189, 194, 210, 212, 227, 230, 236, 239, 247, 250, 256, 260, and salts therof.
• the most preferred compounds are those numbered: 4, 5, 25, 29, 79, 91, 184, 189, 194, 212, 227, 230, 236, 239, 247, 250, 256 and 260, and salts thereof, especially compounds 250, 251, 256, 257, 260 and 261.
• Culture medium 199 containing 0.5% peptone was used for culturing L-M cells (for the culture medium 199, see, for instance, Morgan et al. , Proc. Soc. Exp. Biol. Med., 73 , 1 (1950) or Morgan et al. J. Natl. Cancer Inst., 16 , 557 (1955).
• About 5 x 104 of L-M cells were placed in each well of a culture plate with 24 wells, and cultured using a CO2 incubator (37°C, 5% CO2) until confluence. After removing the culture medium, the cultured cells were washed once with a wash solution which was 199 culture medium containing 0.5% bovine serum albumin (Fraction V, Sigma).
• test compounds were added to a specified concentration to al199 culture medium containing 0.5% bovine serum albumin, and used to treat 0.5 ml of L-M cells. After culturing the L-M cells in a CO2 incubator for 24 hours, the medium was recovered and the NGF level was determined.
• NGF was quantitatively determined using an enzyme immunoassay [Korshing, Thoenen, et al. Proc. Natl. Acad Sci. USA, 80 , 3513-3516, (1983)].
• 75 ⁇ l of a solution of anti-mouse ⁇ -NGF antibody (0.3 ⁇ g/ml, pH 9.6; Boehringer Mannheim) was pipetted into each well of a polystyrene plate with 96 wells. After allowing the plate to stand at room temperature for an hour, the antibody was removed by washing three times with the wash solution. 50 ⁇ l of a solution of standard ⁇ -NGF (Wako Pure Chemical Industries Ltd.) or of the recovered medium was pipetted into the wells.
• the amount of NGF was calculated from a standard curve. The results are expressed as a relative value (%) which is relative to the amount of NGF produced and secreted by cells treated not with the test compounds. The numerical values (% Control) are expressed by the mean value in the 3 wells of the control (without addition of the test compounds).
• novel phenyl derivatives of the present invention include compounds which exhibit excellent activity in promoting the production and secretion of NGF. They are also low in toxicity.
• the active derivatives are thus of use in the therapy of dementia, cerebral ischemia and various kinds of nerve dysfunction.
• compositions which comprise a compound of general formula (I), with the exception of intermediate compounds where R1 is a nitro group, together with a pharmaceutically acceptable carrier.
• Examples of administration routes for the active compounds (I) of the present invention include oral administration by formulation of the pharmaceutical composition as tablets, capsules, granules, or syrups; and parentheral administration by formulation as injections or suppositories.
• the pharmaceutical compositions can be prepared using appropriate additives such as vehicles, binders, disintegrators, lubricants, stabilizers or corrigents, according to the conventional procedures.
• the dosage may vary depending on the symptoms and age of a patient, but usually is from 0.1 to 1000 mg/kg a day, preferably from 1 to 100 mg/kg a day, which in general may be administered to human adults once per day or divided into several doses.
• the compounds of the present invention of the general formula (I) can be prepared by a process provided by this invention, which comprises amide formation through reaction of a reactive carboxylic acid derivative of general formula (II) with a compound of general formula (III) to give a compound in accordance with this invention of formula (I′), in accordance with the following reaction scheme:
• R 1′ represents a nitro group, a substituted amino group substituted by 1 or 2 groups selected from the members of Substituent Group A as defined in claim 1, or a protected amino group
• R 2′ represents a substituted amino group substituted by 1 or 2 groups selected from the members of Substituent Group A as defined in claim 1, a protected amino group, a substituted hydroxy group substituted by a group selected from the members of Substitutent Group A as defined in claim 1, or a protected hydroxy group
• Y represents a leaving group and R3, m and n have the meanings given above, followed if necessary or desired by optional conversion of the product to another compound of this invention,
• the process includes reacting a reactive carboxylic acid derivative of general formula (II) with a compound of the general formula (III). This reaction is suitably carried out in an inert solvent in the presence of a base, and proceeds with formation of compound (I′) and HY.
• the leaving group Y is not critical, and Y is suitably a leaving group of the kind conventionally employed for such a nucleophilic reaction of amide formation.
• the leaving group Y is a halogen atom such as chlorine, bromine or iodine; an alkanesulphonyloxy group having from 1 to 6 carbon atoms in the alkane group, such as a methanesulphonyloxy or ethanesulphonyloxy group; a haloalkanesulphonyloxy group having from 1 to 3 carbon atoms in the alkane group and 1 to 6 halo substuents, such as a trifluoromethanesulphonyloxy or pentafluoroethanesulphonyloxy group; or an arylsulphonyloxy group optionally having from 1 to 3 alkyl substituents each having from 1 to 3 carbon atoms, such as a benzenesulphonyloxy or p
• the identity of the inert solvent is not particularly limited, provided that the solvent does not affect the reaction and can dissolve the starting materials to some extent.
• preferred solvents include aromatic hydrocarbons such as benzene, toluene or xylene; halohydrocarbons such as methylene chloride or chloroform; or ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran or dioxane.
• the identity of the base is also not particularly limited, provided that the base is effective in such a reaction.
• preferred bases include organic base such as triethylamine, tributylamine, diisopropylethylamine, N-methylmorpholine, pyridine, 4-(N,N-dimethylamino)pyridine, N,N-dimethylaniline, N,N-diethylaniline, 1,5-diazabicyclo[4.3.0]nona-5-ene, 1,4-diazabicyclo[2.2.2]octane (DABCO) or 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).
• organic base such as triethylamine, tributylamine, diisopropylethylamine, N-methylmorpholine, pyridine, 4-(N,N-dimethylamino)pyridine, N,N-dimethylaniline, N,N-diethylaniline, 1,5
• the reaction of amide formation may be encouraged to proceed more effectively by the addition of a quarternary ammonium salt such as benzyltriethylammonium chloride or tetrabutylammonium chloride, or a crown ether such as dibenzyl-18-crown-6.
• a quarternary ammonium salt such as benzyltriethylammonium chloride or tetrabutylammonium chloride
• a crown ether such as dibenzyl-18-crown-6.
• the reaction is preferably carried out at a temperature from -10° to 50°C, more preferably at from 0° to 30°C, and usually takes from 1 to 3 hours, though the time varies with factors such as the reaction temperature, the identity of the starting compounds, reaction reagents and inert solvent.
• the desired compound of general formula (I′) of the present invention can be obtained from the reaction mixture by the use of conventional isolation methods.
• the reaction mixture is suitably neutralized, and, after filtering off any insoluble matter off, a water-immiscible organic solvent is added.
• the solvent extract can then be separated, washed with water, and distilled to remove the solvent, thereby giving the target compound.
• the target compound can be further purified by conventional techniques such as recrystallization, reprecipitation and/or chromatography.
• One or more of the optional conversions can be effected.
• the order is not critical, and different deprotection reactions can be effected simultaneously. Isolation of the product of the amide reaction may not be necessary before the conversion can be carried out.
• the optional conversion (1) where a nitro group is converted to an amino group, can be performed by customary methods available for reduction of nitro groups to amino groups. Suitable reduction methods include:
• the optional conversion (2), where an amino protecting group is removed, and also that part of optional conversion (3) where an amino protecting group is removed, can be performed by customary methods which vary depending on the nature of the actual protecting group.
• the amino protecting group is a silyl group
• it can be removed by treatment with a compound capable of generating a fluoride anion, such as tetrabutylammonium fluoride.
• the treatment is typically effected in a solvent.
• the identity of the solvent is not particularly limited provided that it does not affect the reaction.
• An ether such as tetrahydrofuran or dioxane is preferably employed.
• the reaction temperature and reaction time are also not particularly limited, and usually the silyl deprotection reaction is carried out at room temperature requiring from 10 to 18 hours.
• amino protecting group is an aliphatic acyl group, an aromatic acyl group, an alkoxycarbonyl group or a substituted methylene group forming a Schiff base
• deprotection can be effected by treatment with an acid or a base in the presence of an aqueous solvent.
• an acid is used, the identity of the acid is not particularly limited, and preferably is an inorganic acid such as hydrochloric acid, sulphuric acid, phosphoric acid or hydrobromic acid.
• the identity of the base is not particularly limited, provided that it does not affect the rest of the compound, and preferably is an metal alkoxide such as sodium methoxide; an alkali metal carbonate such as sodium carbonate or potassium carbonate; an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide; or ammonia such as in the form of aqueous ammonia solution or concentrated ammonia-methanol.
• the choice of solvent is not particularly limited, typically being one usually employed for hydrolytic reactions, and is preferably water; an organic solvent, for example an alcohol such as methanol, ethanol or propanol, or an ether such as tetrahydrofuran or dioxane; or a mixed solvent of water and an organic solvent.
• the suitable reaction temperature and reaction time will vary depending on the starting materials and acid or base employed and are thus not particularly restricted. In order to minimize side reactions, the deprotection is usually carried out at from 0° to 150°C requiring from 1 to 10 hours.
• amino protecting group is an aralkyl group or an aralkyloxycarbonyl group
• deprotectoin methods which can be employed. In general, it can be removed by contact with a reducing agent in a solvent, preferably by catalytic reduction using a catalyst at room temperature, by using an oxidizing agent, by treatment with an alkali metal, or by treatment with a halide.
• a solvent for deprotection by catalytic reduction is not particularly limited provided that it does not participate in the reaction, and is preferably an alcohol such as methanol, ethanol or isopropanol; an ether such as diethyl ether, tetrahydrofuran or dioxane; an aromatic hydrocarbon such as toluene, benzene or xylene; an aliphatic hydrocarbon such as hexane or cyclohexane; an ester such as ethyl acetate or propyl acetate; a fatty acid such as acetic acid; or a mixed solvent thereof with water.
• an alcohol such as methanol, ethanol or isopropanol
• an ether such as diethyl ether, tetrahydrofuran or dioxane
• an aromatic hydrocarbon such as toluene, benzene or xylene
• an aliphatic hydrocarbon such as hexane or cyclohe
• the choice of catalyst is also not particularly restricted and can be one usually employed for catalytic reduction, such as palladium-carbon, Raney nickel, platinum oxide, platinum black, rhodium-aluminum oxide, triphenylphosphine-rhodium chloride or palladium-barium sulphate.
• the pressure for the reduction is not particularly limited, the reaction is carried out usually under from 1 to 10 atmospheres.
• the reaction temperature and reaction time can vary depending on the starting materials and the kind of catalyst employed, but the reaction is usually conducted at from 0° to100°C requiring from 5 minutes to 24 hours.
• the choice of solvent is not particularly limited provided that it does not participate in the reaction.
• the preferred solvent is an aqueous organic solvent, for which the organic solvent may be a ketone such as acetone; a halohydrocarbon such as methylene chloride, chloroform or carbon tetrachloride; a nitrile such as acetonitrile; an ether such as diethyl ether, tetrahydrofuran or dioxane; an amide such as dimethylformamide, dimethylacetamide or hexamethylphosphorotriamide; or a sulphoxide such as dimethylsulphoxide.
• the organic solvent may be a ketone such as acetone; a halohydrocarbon such as methylene chloride, chloroform or carbon tetrachloride; a nitrile such as acetonitrile; an ether such as diethyl ether, tetrahydrofuran or dioxane;
• the oxidizing agent is typically one employed for this kind of reaction and thus the choice is not particularly limited, being for example potassium persulphate, sodium persulphate, cerium ammonium nitrate (CAN) or 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ).
• the reaction temperature and reaction time can vary depending on the starting materials and the kind of oxidizing reagent employed, but the reaction is generally performed at from 0° to 150°C requiring from 10 minutes to 24 hours.
• the reaction is suitably performed with an alkali metal such as lithium metal or sodium metal in an alcohol such as methanol or ethanol, preferably at from -78° to -20°C.
• an alkali metal such as lithium metal or sodium metal in an alcohol such as methanol or ethanol, preferably at from -78° to -20°C.
• suitable reagents include aluminum chloride-sodium iodide or an alkylsilyl halide such as trimethylsilyl iodide in a solvent.
• solvent is not particularly limited provided that it does not participate in the reaction.
• the preferred solvent is a nitrile such as acetonitrile; a halogenohydrocarbon such as methylene chloride or chloroform; or a mixed solvent thereof.
• the reaction temperature and reaction time can vary depending on the starting materials, but in general the reaction is conducted at from 0° to 50°C requiring from 5 minutes to 3 days.
• amino protecting group is an alkenyloxycarbonyl group
• it can generally be removed by treatment with a base under conditions similar to those already mentioned as appropriate for deprotection when the protecting group is an aliphatic acyl group, an aromatic acyl group, an alkoxycarbonyl group or a substituted methylene group forming a Schiff base
• amino protecting group is an allyloxycarbonyl group
• it can be easily removed with minimal side reactions by use of palladium together with triphenylcarbonyl or with nickel tetracarbonyl.
• deprotection of a protected amino group also results at the same time in deprotection of a protected hydroxy group, as envisaged within optional conversion (3).
• That part of optional conversion (3) where a hydroxy protecting group is removed can be performed by customary methods which vary depending on the nature of the actual protecting group.
• the hydroxy protecting group is a silyl group, an aralkyl group, an aralkyloxycarbonyl group, an aliphatic acyl group, an aromatic acyl group, or an alkoxycarbonyl group, or an alkenyloxycarbonyl group, it can be removed by the corresponding procedure given for removal of such a group when employed as an amino protecting group.
• the hydroxy protecting group is an alkoxymethyl, tetrahydropyranyl, tetrahydrothiopyranyl, tetrahydrofuranyl or substituted ethyl group
• it can be removed in general by treatment with an acid in a solvent.
• the acid is preferably a Bronsted acid, an inorganic acid such as hydrochloric acid or sulphuric acid, an organic acid such as acetic acid or p-toluenesulphonic acid, or a strongly acidic cation exchange resin such as Dowex 50W.
• the choice of solvent is not particularly limited provided that it does not participate in the reaction, and is preferably an alcohol such as methanol or ethanol; an ether such as tetrahydrofuran or dioxane; or a mixed solvent thereof with water.
• the reaction temperature and reaction time can vary depending on the starting materials and the kind of acid employed, but the reaction is usually carried out at from 0° to 50°C requiring from 10 minutes to 18 hours.
• hydroxy protecting group is an is employed for protection of the hydroxyl group, it can be removed according to the procedure when the amino-protecting group is an alkenyloxycarbonyl mentioned already.
• deprotection of a protected hydroxy group also results at the same time in deprotection of a protected amino group, as envisaged in optional conversion (2) and within optional conversion (3).
• the desired compound of general formula (I) of the present invention can be obtained from the reaction mixture by the use of conventional isolation methods. For example, a water-immiscible organic solvent is added to give a solvent extract which may be washed with water, and distilled to remove the solvent, thereby giving the target compound. If necessary, the target compound can be further purified by conventional techniques such as recrystallization, reprecipitation and/or chromatography.
• the reactive carboxylic acid derivative of general formula (II) required as starting material for the process provided by the present invention can be prepared from the corresponding parent carboxylic acid, for example by conventional halogenation. Such halogenation is typically performed by treatment with a conventional halogenating agent.
• the halogenating agent is preferably a thionyl halide such as thionyl chloride, thionyl bromide or thionyl iodide; a sulphuryl halide such as sulphuryl chloride, sulphuryl bromide or sulphuryl iodide; a phosphorus trihalide such as phosphorus trichloride, phosphorus tribromide or phosphorus triiodide; a phosphorus pentahalide such as phosphorus pentachloride, phosphorus pentabromide or phosphorus pentaiodide; or a phosphorus oxyhalide such as phosphorus oxychloride, phosphorus oxybromide or phosphorus oxyiodide.
• a phosphorus oxyhalide is especially preferred as the halogenating agent.
• the parent acid itself will be a known compound or one which can easily be prepared by known methods.
• a carboxylic acid such as 3-nitro-4-aminocinnamic acid having a nitro and an amino substituent can be synthesized, for example, according to the method described in Annalen Chimica 48 , 958-991 (1958) or in Chem. Ber. 16 , 2042.
• a carboxylic acid such as 3-nitro-4-hydroxycinnamic acid having a nitro and a hydroxy substituent can be synthesized, for example, according to the method described in J. Chem. Soc. 3072 (1952) or in J. Am. Chem. Soc. 79 , 4114 (1957).
• a carboxylic acid having two amino substituents, or a carboxylic acid having an amino and a hydroxy substituent can be prepared by reduction of a corresponding nitro compound.
• Carboxylic acid compounds having more carbon atoms can be prepared by analogous methods or by methods relying on extension of the carbon chain.
• a known aminocinnamic acid or hydroxycinnamic acid can be protected at the respective amino or hydroxy group, subjected to a carbon chain extension reaction, nitrated, and deprotected, followed optionally by reduction of the nitro substituent.
• a starting carboxylic acid is reduced to the corresponding alcohol, then the hydroxy group is activated to form a leaving group such as a halogen atom, for example a chlorine, bromine or iodine atom; an alkanesulphonyloxy group, for example a methanesulphonyloxy or ethanesulphonyloxy group; a haloalkanesulphonyloxy group, for example a trifluoromethanesulphonyloxy or pentafluoroethanesulphonyloxy group; or an arylsulphonyloxy group, for example a benzenesulphonyloxy or p-toluenesulphonyloxy group, and then the carbon chain of the thereby activated compound is increased by one or two carbon atoms by adoption of one of the following procedures, usually effected at a temperature of from -78
• the method using 1,3-dicyan can be performed by reaction of 1,3-dicyan with an organic or inorganic base, such as sodium hydride, potassium methoxide, potassium hydroxide or lithium diisopropylnitride, in an ether such as diethyl ether, diisopropyl ether, tetrahydrofuran or dioxane in an inert gas atmosphere such as nitrogen, to give its metal salt, which is then reacted with the activated compound, further followed by hydrolysis using a strong acid such as hydrochloric acid.
• organic or inorganic base such as sodium hydride, potassium methoxide, potassium hydroxide or lithium diisopropylnitride
• an ether such as diethyl ether, diisopropyl ether, tetrahydrofuran or dioxane
• an inert gas atmosphere such as nitrogen
• the method using a metal cyanide can be carried out by reaction of a metal cyanide with the activated compound to form the corresponding cyano compound followed by hydrolysis by conventional means.
• the method by reaction with carbon dioxide after preparation of a Grignard reagent can be effected by preparing a Grignard reagent from the activated compound by conventional means followed by reaction with carbon dioxide in accordance with customary techniques.
• the method by use of a malonic acid derivative can be carried out by reaction of a malonic acid derivative with a metal base in an ether such as diethyl ether, diisopropyl ether, tetrahydrofuran or dioxane to form the metal salt, followed by reaction with the activated compound by conventional means, further followed by decarbonation and/or hydrolysis.
• an ether such as diethyl ether, diisopropyl ether, tetrahydrofuran or dioxane
• the choice of the metal base may depend on the pKa of the malonic acid derivative, but is suitably an inorganic base, for example an alkali metal carbonate such as sodium carbonate or potassium carbonate; an alkali metal hydride such as lithium hydride, sodium hydride or potassium hydride; or an alkali metal hydroxide such as sodium hydroxide, potassium hydroxide or barium hydroxide; an organic metal base like an alkali metal alkoxide such as sodium methoxide or sodium ethoxide; butyllithium; or lithium diisopropylamide.
• an alkali metal carbonate such as sodium carbonate or potassium carbonate
• an alkali metal hydride such as lithium hydride, sodium hydride or potassium hydride
• an alkali metal hydroxide such as sodium hydroxide, potassium hydroxide or barium hydroxide
• an organic metal base like an alkali metal alkoxide such as sodium methoxide or sodium ethoxide
• the acidolytic method using an acetoacetic acid derivative can be performed by reaction of an acetoacetic acid derivative with a metal base such as one of those mentioned for the malonic acid method, in an ether such as diethyl ether, diisopropyl ether, tetrahydrofuran or dioxane, to form the metal salt at its methylene moiety, followed by reaction with the activated compound by conventional means, further followed by hydrolysis using an acid.
• a metal base such as one of those mentioned for the malonic acid method
• the Wittig reaction can also be used and represents a general method for increasing by any desired number of carbon atoms the length of the carbon chain of the carboxylic acid.
• a carboxylic acid having a double bond at a desired position can be obtained, or alternatively the double bond can be removed by reduction.
• the Wittig reaction is suitably carried out by reaction of a Wittig reagent with an appropriate aldehyde, followed by the optional reduction of the double bond in the resultant product according to conventional procedures.
• Nitration of the carboxylic acid to introduce a nitro group is conveniently performed by conventional means.
• it can be carried out by use of a nitrate derivative capable of introducing a nitro group, such as fuming nitric acid at from room temperature to 50°C in an acid solvent such as acetic acid - acetic anhydride.
• Rf value 0.5 (developed with ethyl acetate : hexane, 1 : 1 by volume).
• N -(1-adamantyl)-3-(3-nitro-4-aminophenyl)propionamide prepared as described in Example 21
• 200 mg of 10% w/w palladium-on-carbon was added to the solution, which was then catalytically reduced whilst bubbling hydrogen through it, under atmospheric pressure for 120 minutes.
• the catalyst was then removed by filtration, and the methanol was removed by distillation under reduced pressure.
• the resulting residue was purified by silica gel column chromatography, using 19:1 ethyl acetate:methanol as the eluent, to afford 0.21 g of the title compound as crystals, melting at 151 - 152°C.
• Rf value 0.50 (developed with ethyl acetate).
• Rf value 0.50 (developed with ethyl acetate).
• the filtrate was acidified by the addition of 3N aqueous hydrochloric acid, and the crystals which separated were collected by filtration, and were dissolved in 500 ml of tetrahydrofuran.
• the solution was mixed with active charcoal, heated under reflux for 5 minutes and filtered whilst being kept warm.
• the solution was condensed to about 100 ml by evaporation under reduced pressure, and allowed to stand at room temperature to obtain 15.0 g of the title compound as a yellow solid.
• the product had an R f value of 0.62 by thin layer chromatography on silica gel when eluted with ethyl acetate.

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